One of the biggest challenges of digital DJing has been seamlessly changing over from one DJ to the next and playing back-to-back DJ sets. Now, with the next-level architecture of the Rane Sixty-Four mixer, swapping between digital DJs has never been easier.

At the top of each channel is the Source Select knob. This knob switches input sources. If your computer is connected to USB port B, switching a channel Source Select knob to USB B, the mixer assigns the corresponding virtual deck to that channel for audio playback.

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The same applies to USB port A. If your computer is connected to USB port A, switching a channel Source Select knob to USB A, assigns the corresponding virtual deck to that channel for audio playback. For example, assigning all four channels to USB 1A-4A, assigns all four virtual decks to the computer connected to USB port A.

When two DJs are connected to the Sixty-Four, they can quickly swap deck control between computers using the Source Select knobs. Any of the four virtual decks can be swapped back and forth with a simple twist of a knob. Nice and easy, just the way we intended.

To enhance your back-to-back mixing experience, the Sixty-Four comes equipped with two USB effect inserts. The USB Inserts allow you to route audio from the Sixty-Four back to your computer for post-fader effects. Now, with two USB Inserts, both DJs can quickly route audio back to their computers using independent inserts for USB A and B. This gives both DJs the flexibility to swap insert audio routing as easily as swapping decks.

I've actually had a similar issue. The downside is that I completed a copy from a failed hard drive then Ubuntu decided to complete a small change to my swap. Since my config was not setup properly, everything just broke with the exact same problem.

I can try to do this with Gparted but my main concern is losing my current set up in Ubuntu as I'm not entirely sure what will happen if I mess with swap as suggested in the thread. Anyone able to help?

I had the same issue after resizing my primary partition on my VM since gparted live forced me to delete & reinitialize my swap to do so. That caused a new UUID to be set that didn't match the fstab file.

Looks like the issue was due to the fact that even though fstab had an entry for a swap, there actually wasn't one. I used GParted to resize the partition and created a new Swap. I then copied the UUID into the fstab file...

In my case, I had previously been using encrypted swap, and the startup job mentioned /dev/mapper/cryptswap1. To solve the problem I also had to remove the file /etc/crypttab, in addition to the steps described in the answer by William MacDonald.

Furthermore you have to copy the new UUID into /etc/fstab to mount it otherwise at boot the OS will attempt to find it but in vain because the fstab file contains the UUID referring to the old swap. Gparted delivers the information for the UUID but you can easily run in terminal:

Looking at the disk in a partition manager (gnome-disks in my case) revealed that /dev/sda2 was assigned to be a swap partition but for some reason had a different UUID. Simply fixing the UUID as root in /etc/fstab fixed it.

Say, for a process, I know it has a page located at virtual address 0x42424242. I want to manually swap it out to the swap area. From user space I think it's hard to do so. I didn't find any related commands to force the kernel to do it. Does that mean I have to hack the kernel and implement this feature?

Whenever someone calls malloc() the kernel algorithm will seek the oldest known page and either free or swap it out, depending whether such page's dirty bit flag is, it's reasonable to assume at first these pages will likely be from processes predating your own.

Yes, when used with DJ software, a single LC6000 can be used to control multiple software decks. Press Shift + Slip to activate deck select mode. Pads 1-4 will flash allowing you to choose any available deck.

Depending on how you set up your LC6000s with your Denon DJ Dual-Layered Media Players, you may want to swap the deck info box left or right. To do this, hold both the Shift and View buttons for 2 seconds. The moving waveform position cannot be swapped.

Physical swap is much less responsive (time wise) than zram, and having only 4GB is also not enough as you can see. Zram uses compression and actually allows close to 16GB of data into the default 8GB of zram, though zram size can also be adjusted according to needs.

When/if those idle processes finally start up again, that will be a little slower than it would have been if their anonymous memory were never swapped. But meanwhile various file I/O ran a tiny bit faster because of the extra caching. Neither matters much for just 4GB. But in terms of total wait time, it is very unlikely that the swapping increased total wait time.

I just tested your scenario on a notebook with 12GB RAM. Added tree large torrents (fedora isos with a total download size of 15GB). My system still has the default swappiness=60. Swap usage is 0, before and after starting the torrent download.

It is important to understand swap space that is occupied long term vs. actively read and written. In the cases discussed in this thread, it is very likely each used page of swap space was written once, not yet read once and never rewritten (since the last boot). That is a trivial write load on the SSD (compared to all the files that temporarily exist during ordinary use of a computer).

In some other system with massive use of anonymous memory, the effect of swap on the life of the SSD might be significant, but in that case the fact that zram only frees half the space is very significant, so accepting the slightly shortened life of the SSD is likely the right answer (if you expect computer parts to continue improving price performance over that period of time).

When you disable swap, all the anonymous memory must stay in physical ram so mapped memory and cache memory are hit. You have so much more ram than you really need that the hit should fall almost entirely on cache and not really change the amount of mapped memory that is bumped. If you had less excess ram then disabling swap actually slows the recovery of previously idle processes because it is slower for them to recover their mapped memory.

A swap file is a system file that creates temporary storage space on a solid-state drive or hard disk when the system runs low on memory. The file swaps a section of RAM storage from an idle program and frees up memory for other programs.

Swap files are not stored in physical RAM, which is why they are a type of virtual memory. Having a swap file allows a computer's operating system (OS) to pretend that it has more RAM than it actually does. The least recently used files or programs in RAM can be "swapped out" to the hard disk until they're needed later, allowing new files or programs to be "swapped in" to RAM.

They can handle the extra load of memory consumption. Some applications consume a huge amount of RAM, depriving other background applications that also need memory. Swap files help resolve this situation by paging out idle files to provide extra virtual memory.

Unforeseen circumstances. When a particular program consumes extra memory, or when extra space is needed for device operations, swap files provide some breathing room until the user can come up with a more permanent solution, such as a RAM upgrade.

While swap files help extend physical memory and thus make it possible to run more programs, they can also lead to system slowdowns. The file swaps out idle programs for in-use programs multiple times, which causes a lot of reading and writing on the system drive.

Swap files can be permanent or temporary. Operating systems such as Windows can be configured to use temporary swap files, while others such as Unix and Linux can set aside a permanent swap space to create a permanent swap file.

Permanent swap files take a contiguous section of a hard disk. By organizing the swap file in a single contiguous space, fewer I/O operations are required to read or write a complete file, so it doesn't affect system speed or performance as much as a temporary swap file. However, permanent swap files also take up more disk space, so if this space is already limited, they could slow down the system.

In Windows 10, swap files or page files are hidden with the .sys extension stored on the system drive. The swapping process begins automatically whenever a user opens more applications than the RAM can accommodate.

Linux has two types of swap space. One is the swap partition, a dedicated section or partition on the drive. The second is the swap file that resides among system and data files and is easy to resize.

Learn some tips to improve Windows 10 performance and check out the differences between Windows 10 and Windows 11. Also, explore over 80 useful Linux commands, read up on how to optimize Linux swap space usage and find out how memory compression compares to page swapping.

At this point, the system will manage the swap like you just configured it, BUT if you reboot NOW, your change will be forgotten and the system will work with the default value (assuming 60, meaning than it will start to swap at 40% occupation of RAM).

The opposite, in fact -- rebooting will reset the swappiness to its default value. To make it persist across reboots, you need to include a directive in a boot script or use the method recommended in the wikipedia article by adding:

Those who've already modified the global config file "/etc/sysctl.conf" might want to remove lines defining this "swappiness" value from that file. You could use this command to remove these lines from the global config file (keeping comments):

User changes to sysctl by convention go into files with the prefix 60- so the filename should be /etc/sysctl.d/60-swappiness.conf. Execute service procps start as root to force a reread of configuration values (no reboot needed). 0852c4b9a8

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